Assertion : Forelimbs of vertebrates are homologous organs
Reason : Analogous organs have same origin but different functions
In a monohybrid cross, pink coloured flowers are dominant over white coloured flowers.
Kalawati often blames her daughter-in-law for having only daughters and no son.
Study the following cross and showing self-pollination in F1, fill in the blank and answer the questions that follows.
Distinguish between acquired and inherited characters with an example of each.
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures.
A recessive homozygote is crossed with a heterozygote of the same gene.
A man having blood group O (IOIO) marries a woman with blood group B (IBIO).
What are homologous structures? Give an example.
Mention three important features of fossils which help in the study of evolution.
Variations are the basis of heredity. Explain.
A trait may be inherited, but may not be expressed. Justify this statement with the help of a suitable example.
All the human races like africans, Asians, Europeans, Americans and other might have evolved from a common ancestor. Provide a few..
Explain how the variations get accumulated.
Traits that are acquired during lifetime do not result in evolution. Why?
(i) Give the evidence that the birds have evolved from reptiles.
(ii) Insects, Octopus, Planaria and vertebrates possess eyes.
Bacteria have a simpler body plan when compared with human beings.
Assertion : Evolution is called as organic evolution
Reason : Evolution involves the living organisms
In pea plant, round seed is dominant over the wrinkled.
Define evolution. How does it occur? Describe,
How do genes control the traits? Explain in detail.
A scientist is conducting embryological studies for collecting evidence supporting evolution.
The genotype of the height of an organism is written as Tt. What conclusion may be drawn?
Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.
Explain the original idea of tracing evolutionary relationships.
Evolution is a/an
Assertion : Dominant allele is an allele
Reason : It is represented by a capital letter
Assertion : Changes in non-reproductive
Reason : Inherited traits include the traits
Assertion : The ratio of plants when Mendel took pea plants
Reason : The ratio of plants when Mendel took pea plant with one cont..
Assertion : Speciation is the development of one or more species from an existing species.
Reason : Classification is the arrangem..
X, Y and Z are three animals. The animal x can fly, but animal y can only run on ground or walls
There is no real progress occuring in the concept of evolution. Explain.
The two areas of study namely evolution and Classification are interlinked. Justify the statement.
Name any five vegetables generated from a common ancestor through artificial selection rather than natural selection.
Assertion : The sex of the children will be
Reason : A human male has one x and one Y-chromosome
(i) How do we get an idea about the extinct
(ii) What are connecting links? Give one example
Give reason for your choice.
A person first crossed pure-bread pea plants having round-yellow seeds with pure-bread
What is speciation? List four factors that could lead to speciation.
A man with blood group A married a woman with blood group O and their daughter has blood group O.
Name two human traits which show variation.
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